C2C e-commerce involves direct transactions between consumers through an online marketplace or auction platform facilitated by a third party. It originated from auction houses dating back to the 16th century and became popular online with the rise of the internet. Key features include consumers acting as both buyers and sellers, browsing and bidding on various products, and backend administration tools. The business model involves consumers advertising products for sale directly to other consumers through sites that bring buyers and sellers together but require registration. Advantages are constant availability and updating, while disadvantages include lack of payment guarantees, potential for theft, and inability to control product quality.